Suction box



Nov. 23 1926. 1,608,202

G. C. COMPTON SUCTION BOX Filed Oct. 9, 1924 47m/WMU lll Patented Nov. 2v3., 1926. A

UNITED STA GUY C. COMPTON', 0F HAMILTON, OHIO.

SUCTION BOX.

Application led'October 9, 1924. Serial No. 742,700.

T ken and the machine be laid up for repairs.

The very best wood must be used, and it is necessary to remove the boxes or the wooden tops thereof frequently, for planing. The wood box covers when the wood gets spongy and is planed down, donot maintain true alignment,` andthe centers tend to be sucked down. There is a limited area in the holes through the wood, due to the necessary strength factor with the result that the holes become clogged and the slime imparts a streak to the paper. The wooden box cover gets too flimsy and vibrates excessively, and thus planing down to thinness is not possible. The wood is very expensive in good grades and even then a perfect iece without knots, that would wear throug the wires, is hard to get. Also the area of the boxes is limited because of the necessary limitations in length and width of perfect maple pieces.

It is the object of my invention to provide a suction box cover which does away largely with all of the defects above enumerated of plain wooden suction box to s, andare inexpensive and easy to instal and keep in proper condition. l

It is my specific object to provide a cover with metal body, and pieces. of maple of limited size used as contact pieces for the wire, with the suction spaces between these pieces and below the contact surfaces'thereof.

I accomplish my object by that certain construction and arrangement of parts to be hereinafter more specically pointed out and claimed.

In the drawing: y Figure 1 isa perspective of the device, showing a cover of one section, although more than one can be used end to end on a single box body. f Figure 2 is a section on the line 2-2 of Figure 1.

yFigure 3 is a top plan view of box cover sectlon as shown in igure l. c

The body ofthe box excluding the to is generally indicatedvat 1, with a suction line connection at 2. T he top 3 of the'box is formed of a corrugated metal plate or a' Tas PATENT OFFICE.

solid-plate with ridges and grooves, the

form of the` to or cover being of essential lmportance. T e ridges 4 of the box top are povlded with suction openings 5, which may elongated and of large area compared to the areakof the ridges. The spaces 6 between the ridges are preferably slightly dovetailed. The maple strips 7 are formed 'to fit into the grooves or spaces between the ridges, bein forced into place/and held tightly by the ovetails.

The maple pieces extend crosswise of' the path of the wire of the machine which enis too stiff to sag between the said strips.

The top plate is bolted to thc box as at 8, and may readily be removed, and the whole top yplate set into a planer and planed, to bring the maple strips to a uniform height. As each strip may be planed by itself, it is possible with ordinary tools to do a much evener job of planing" than is done over a wide board, and less wood needs to be regages thetop faces of the maple strips, but

moved, because of the necessity of evening up the planing job.

The wooden strips may be planed down almost to the metal and replacement of strips is easy, since the wood gets spongy and old and the thin strips can readily be pulled out of the dovetails by hand.

When in use the topsand nothing but woo contacts with the screen. The suctionopenings are of largev area, and the wood comes high enough above the ridges to .insure against any materials cau 'ht on the walls of the suction openings, rom streaking the paper. The holes are so large, however, that very little material will accumulate, and never suflicient material to clog the holes.

The swelling of the wooden pieces would hold them in place even if the dovetails were not used, but the sponginess and swelling does not distort the surface `of the suction box cover as it tends to do when wooden pieces form the entire top of the suction box. As the wooden pieces are small, it will be easier to get perfect pieces, without holes or knots, and vibration will not set up movement in the top of the suction box,

are always rigid, i

The sections may be placed end to end,

and preferably will be made up so that two or three tops such as described, will be used across the machine, to cover a single suction box body with the wooden strips in common to the severaltops. Also boxes can be placed side by side without any mechanical limitations as to total suction area, or the boxes may be made as wide as desired, and the tops the same width, since the width of the wood strips is not a limitation.

If it is desired to remove the maple pieces without dismounting the top from the box, this will be an easy matter, since as described thewooden pieces will strip out, and new pieces then dropped into place, and tapped down.

It will be necessary at the ends of the grooves formed between the maple pieces to insert small blocks 9 to close off the ends of this space, and due to the arrangement there is a suction chamber clear across the box between each strip, instead of a distributed suction formed of separated openings as in present forms of suction boxes.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is

1. A suction box for paper machines coinprising a box, and a cover for the box formed of a metal plate, having permanently united means thereon for engaging interspaced lengthwise wooden contact strips, and suction openings arranged between the strip engaging means, for the purpose described.

2. A suction box for paper machines comprising a box and a cover forthe box formed of a permanently ribbed surface, wooden strips set removably` between the ribs, the cover having suction openings located in the ribs.

3. A suction box for paper machines coinprising a box and a cover, narrow wooden strips interspaeed across said cover. the cover having suction openings located between the strips.

4. A suction box for paper machines comprising a box, a cover for the box. said cover having interspaced ridges therein and extending across it, wooden strips set bctween the ridges, said ridges having suction holes therein, and the wooden strips thick enough to come above the ridges, for the purpose described.

GUY c. ooMP'roN. 

